When I was working at Sport Chalet on a Star 3, I was able to string a racquet in 25-35 minutes.
Now days it takes me like 45-60 minutes, I guess I'm older, I don't string 10 racquets a day anymore, and my X-St/ Wise is not as fast as a Star 3.
6.0 Prostaff Org 95 with (M) KLIP Legend Gut 16 & (X) SPP HEXtreme Pure 1.20mm
Alpha Apex II with Wise 2086 Electronic Pro. Head Tensioner